*Surely there's a fourth group too? There was a post upthread (I think it was you banana?) about donating embryos for surrogacy?
So there's
1 TS genetic mother is surrogate and father an IP
2 GS genetic mother is an egg donor and father an IP
3 GS both genetic parents come from embryo donation
4 GS both genetic parents are IPs
Is that right?*
No, group 4 is not permitted for surrogacy
A baby has to be genetically related to at least one of the IPs
So you could have GS with donor egg but the IF's sperm. Baby is genetically related to one IP, but unrelated to the surro .
Or GS with the IM's egg but donor sperm. Baby is genetically related to one IP, but unrelated to the surro .
Or TS with the surro's egg and the IF's sperm. Baby is genetically related to one IP and genetically related to the surro
Embryo donation is similar to egg donation and sperm donation. It's for a couple where they can't use the mother's eggs, so can only use a donated egg. They may opt for embryo adoption using two sets of donor gametes rather than a father's sperm, for a number of reasons. These are usually leftover embryos frozen embryos from another couple's cycle, where they don't want the embryos to be destroyed or used for research, and to have a chance of life
Scenarios for embryo donation can include:
A couple would need to use donor eggs but aren't comfortable with only one parent being the genetic parent and one not, and would prefer their baby to be either genetically theirs or adopted
A woman is single but can't use her own eggs and would need both donor eggs and a sperm donor
A couple have both sperm and egg issues and would need donor egg and donor sperm